Re: uClibc

[Mark Williamson <maw48@cl.cam.ac.uk>]

> How do the resources used differ?

I can't put exact numbers on it but using Python will certainly result in a 
larger memory footprint being necessary for domain 0.

Python's not an enormously fast language but that doesn't matter too much for 
control plane functionality (performance critical stuff is coded in C 
already).

> Is Xend currently in python?

The control tools and Xend are written in Python.

The migration / suspend daemon (xfrd) is also coded in C for performance 
reasons.

> Is there 
> a plan to change this? What has been the reasoning behind developing it
> in python?

The use of Python in Xend enables rapid development - Xend does _a lot_ of 
different tasks, so it's good to have as much high-level goodness on your 
side as possible.  I don't think we're likely to change language in the near 
future.

Compared to the amount of memory spent on other domains, Xend's footprint is 
arguably still likely to be pretty small, although obviously it depends 
somewhat on the application.

The lowlevel functions for interfacing to Xen are available in a separate C 
library so it's possible to hook arbitrary languages into Xen.  It's 
certainly possible for Xend to be rewritten in C but it would be a large job 
to provide equivalent functionality.

An alternative control daemon called "x2d2" is in the unstable tree (what 
about the testing tree?  not sure...) but this is intended for developer 
experimentation and is not a full-blown Xend replacement.

Cheers,
Mark

>
> > Input and cooperation is welcomed.
>
> I'd love to help. I like the idea of a 'self installing' dom0 that sets
> up another control domain, thereby abstracting all the running processes
> into unprivileged domains for security reasons. As part of this I will
> look to create a HowTo document that details how I acheive this :)
>
> Regards
>
> Jerome
>
>
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